Supply cost = $49.75
[tex]\begin{gathered} \text{Sales tax = 5.5\% of \$49.75} \\ =\text{ }\frac{5.5}{100}\text{ x 49.75} \\ =\text{ }\frac{5.5\text{ x 49.75}}{100} \\ =\text{ }\frac{273.625}{100} \\ =\text{ \#2.73625} \end{gathered}[/tex]Chris paid = $49.75 + $2.73625
= $52.49